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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0748bf1f9778f5cd5ed6ad7ee28ba410837130819a3fd337c0798b59f325ca73' 
  AND token = 'QA8PzrPf/w0c3GgB0EkCVyLN5TagUsUZmtAltFi0sVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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