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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bfee293e07d6d8a3f3f7380fa73f3d837a0ccfd24cc044ec502851d6505e86' 
  AND token = '0bFdH9k+nCRkgzJcZcnz/QhW5zDWqiDYqqy2UGFG6eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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