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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0c921c8ad2c941568255b344ac24599a9e3b9d996acb8d8a92f733165203de' 
  AND token = '4SvoRuGUGZ1EDjYlY21Kv8VsaD4OBm2mv67actuXPpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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