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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad3ec0814d3a0c4d6bafd2aa38f429b5cbfc772cd797c1c99f669acd2ffe174' 
  AND token = '9svizqDRKt5b47+m7ZnIGgQxCot4KLsr0IzCURg9tjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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