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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a1e3aca51f85bd7c259788195fd4c2efd4b2bbf227ea20ef3e7071a3bb33f0' 
  AND token = 'hfrQi1nMXATNUBhaZVOs0uVv/AFKSVjxSPpTVfpd1pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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