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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f1432d1a1df723b1072f2ce5bced22c0d2e1e0f9e8cccf3a6e38b541a0bb91' 
  AND token = 'MW0A9woFI8DjBKU8xQ/sGYla3tUjX5q7v/8YaWBvQE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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