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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f86b63550499811ccf33344e5a4e1e784f99c9601f3a24c161fb05f0caed9f' 
  AND token = 'pnI5OnIR2DX4O7hDI37sy1XNp9wcCCGaJz4+aVwRAm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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