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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac196fc87458cbaf840ed45b9b2f8d011662dad6770058a64b1e1d2f75d9f175' 
  AND token = 'F2++ChzhzMfZhnQW8AtzGE06oiAOMpW3JXhNjWqOXJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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