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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9075ef926d431b181d982d9af027b565bb62891b06c6982322a3c871f03af5' 
  AND token = '/xymRh/GCr0M1k4Cxw891FXJprzU0Vb8xjBwPyysxS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}