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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90378f39bea06727029a028a1177c8a8b61c5d03baa1e03b3a1c526ca6233b5c' 
  AND token = 'K+6wtbamP5+ucD40JVNva7kKsOr7DfeeIOfznFDqtt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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