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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d95176224ada794e3f4208f12426693a28881f25530679a3e1b5b97b6856c0' 
  AND token = 'T84lwIq/JtA/dFqPOqTi1OqvXoC7FuyMFiX2yPENlIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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