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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75e500b16b7f34f521db38a90c33d0595e19b99fd62506e0bcdbde52a4d834d' 
  AND token = 'evbN93x0UT6NtC+YXBeDKcNzl/W5z662iO2BNeiILeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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