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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02df18eaff41f5d65f8f7abeca474f0822ce0d7a9d9baf2b21e6f5721b925618' 
  AND token = 'Ml4rn+1O03YsSwm9NRAVbQAJ0/p2mkl8O0eGXzirNPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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