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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8dd53537009453df6adcc2f017a5d57176c8e20115c83004bf5687a0711d30d' 
  AND token = 'WA1inJkP6+h9rqZ6LQvkUXxeE2EHx1LieR559rfWhhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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