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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b655c619ed2669d1f3f9116af8b5b57d183953aef57ce5d10e7f6d3a3a06476' 
  AND token = 'CoTJjDA+i1lXM5E4Z0TP90YZf6gFAvcD8fAPLFXZN+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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