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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89530b25a35418ecc16c0f172a4d329024ce31991b1dadb801eacb83df7fe76' 
  AND token = 'wxbE8xe9Qkj+g3R1Hc7cYNT9J4hn1ZqCJaxqdRKtwQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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