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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c36a01ff3f9ae4ad6e713386d7cd96da36772ac801c317fad67aa76187e1b89' 
  AND token = 'eqJ88j2W+eNt1opfZJew/nJ0C+gR2+AR9GmIQ3qjFJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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