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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23dea1e956b2ba3353d3b43ab3ff906a991f822e37a3cb858e8819cb1a49d0bd' 
  AND token = '0nahCO8tiAPngPpsjsD9jYrZQRvGK/nGm3Wr9CkAgE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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