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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4d8904a497ef52f8bcff2232c0d10c6d6a7918a4578216d8c8f7218e277f3d' 
  AND token = '65eqq4U+Etl51J/Tcty+TuRwMqH6IvavPZIDWSRP3cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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