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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694e18903ee725fc0776c70cc965634cd736027eb58bf21a39533febc0368f6a' 
  AND token = '8mvkA/gECetCL27rGMXVa1s4kLqK0n2WgM4kiGJ1ki0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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