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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a61b85943c13036af4ed9c94bb912b5ec64a0c9989df59ebbfb91f380859e36' 
  AND token = 'Szo5PM00IkKyBHNvYp2W8/T079NpJ+YpoV8GNXa7UsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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