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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb6346588342f574a13ba9be2786881e18205815c4fc328a14f8cebfa9eba28' 
  AND token = 'Iq7OXzHZheTLs9BStLszwrINwFa+k46ArDMI+zyG9iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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