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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b990bf8ee9b7296f69005e2f8a2663c5cb4e41be7be27bf736cd3f0383a30f30' 
  AND token = '4YabGCsXhMDvhDk+KCLKuhy26wdruvIYPbyWP0/Z6Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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