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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a34c57b62f48fba82158d0fb96a2e3da892b1c7b2e268840b812351827523f0' 
  AND token = '12KiiZob9rbHxvsFEQOW8lRdf4EtfJNCAOtMGRKKLR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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