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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75387499a59978ab994717f43c98320a590c5a9e9956aa1526eb099d4782891e' 
  AND token = 'PWW2c0K4JbEkxd0HN6shvnA4jG1jtmr81RaIOPPCHoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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