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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a9611a3d9d4889da0c9e3ffd6898b0a287315008c68ec059a934b67193526b' 
  AND token = 'JSYfleCJQlWZEB3XPpZ6TSGBCVJZsLKNt8/F2OTfOxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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