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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59d10e37682c9f7c3c946e5ab5331fbc9a119b85c9137498eb012834c59f2cb' 
  AND token = 'n3HGRLVbiAX/z2l5wSe4xqGL3TZ8Cy1/vkNe6hoLKrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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