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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b841bdb3ce4aa4dc630656158b64ec147d65fd04bbaf4b7f33e5f6ad160d5e7' 
  AND token = 'rbjt6eeRcEjK0vMyOoseib78VmK5KkOwkqPmD6kHsZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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