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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cd51858eb513beaf5c9213644d0de83ba443a5c8a02e08b1a62fa91d6bfc0a' 
  AND token = 'dD4UoP84iLBFapQQBfIrTbdkh8tLb09vbnFXw9PtXcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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