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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120e215cbea3627897000a6fdd36f0e675acd095bf3751cc2b9051d7ad372b2a' 
  AND token = '2W6AZuKvP9UgqrVyho7SHKc7NOiL3zudn/JIeg21gNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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