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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a4fb1d53e3e800a46350bcf408b47d5c903709bd83eb0640a4f7d22973b9ed' 
  AND token = 'bksV2dCp3GVe4meXe48TqDXtwQEr6JL8iOjJgKnhJhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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