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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29100cd07644b33b2ad12f966291fd42ae5fbd2b0477eec5e63177acdd11da1' 
  AND token = 'BThrhxRm8hAA4dSKhlRj/YocT0YuF35HAsq7hzLO+Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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