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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a022f36010422155fd50b030c4b0326bc020cdc5f4cdd13af04a5e51ce1985' 
  AND token = 'X4nL4d8dLe7vmJREF83rapVSqUJFkOPb4PyRt4F7g/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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