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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a5664b1663a2c573fbebf0a04409c6666b700ae0f87936e02ee09508bb23e5' 
  AND token = 'J9xDkaeg8OhGOeebTYi6gxjj++eEVn7ssv0/AxwEWYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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