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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4ef51156285283e874818a74b6c2f3021b90d6063b135af24237925afae831' 
  AND token = '1wy6A4AlaQfgLjxND3kiIpKWezo7hHd8WyuELLmR+zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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