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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7103cc6fa4357ee6af15fbf9d7408133f414b1029cf4236b24208ea600374a' 
  AND token = 'gBS8KqKViAKdadP5G12rU9q62Eq5wEGBShKp53EkVMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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