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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad14ab9c209335034bd685339da4b6b94f0e19bed30540a7512093942d0038d' 
  AND token = 'n+1klqVsIA7k6SQ/9pq0F5eO3GQN/gi2hrr+oQ7f/Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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