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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82a7188cb7b95acaee4270ad57abc5ef3c4c844248e5e69fa3e0daa5cd6b2f8' 
  AND token = 'ayzh7bEKaVDng1zt3gahTz2MNSvdmNgtlJl7bpvgVLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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