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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b16d92d6817d8fa6ef40b6e4bf1f3a195ff09923411364a06540a9dc79d7150' 
  AND token = '3ANj47q0QraxRSG0IEto43l3Dt+eCkmW0CC2VSgPd1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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