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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc89a1bf39eb9a2d2e85c51b538c8ef657745e92d4e43c274891ef59cbf50688' 
  AND token = 'tY+0e25Zux9Fds0upJi8V/6uQU7LgVMJLsMBl1DhcCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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