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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce96d011c44ef0601d21e7f1100595d74396293bec6680c33a9a353d4928836' 
  AND token = 'A+Wh782gEQbPHKyw1CP4GJTkEkseR+tXZPXmva+CLHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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