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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8ec8e32c2f2669c935e66cd75b9533c1135f378883ed7a017707f8e7de620e' 
  AND token = 'faqZDumr88F8qXux94LnR/fCZRzyVEeJZ6zlLbiPaLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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