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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b7761591cef31f629fd3f46e2fbee697dc9375658445e38926690aef5e3938' 
  AND token = 'ySw33boNDP+1N3uu0P9lBQo0TV3Q9p+7JNIHIoTBCDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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