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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3906ca6a95eafb215d27f0b6f19a1466245d1ff1f5ea53539aab983fb43bf3b3' 
  AND token = 'tZry5YIL+9unzf5PKX6FoJqI5/4B/10qXrVpAI8+EKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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