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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2612c86a11484c5a53e61d5acd5d98fcda5908f4c03cbdcfcaace9bede335fb1' 
  AND token = 'PnAJxtjJoLnhGx0NXa9YjzcCuy6DI5baKa21Sx4CiGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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