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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d82c2395c13b49ade529f7fcab01e15f3ae1b798effa0685cdb5ff9fb9870e' 
  AND token = 'ToF+HCZRXB4essMOVA732qkKTgo7k/fjQxCbvSzdt0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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