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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0faf56b945ccc8e2cb3f717b9a2911a037c9bbd4d6c18c4e7dc8470469aa579b' 
  AND token = '6ct7vKoqdY4agCPTQLm73JePFQr/G3GICpMLkA8WkHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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