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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4d75c8df2004ec9ead97c8914b6beacad84a2b54a26423acde3f7adae50b89' 
  AND token = 'MdzV2WRHKbW96Il5bJpp9qj+l7V4U9V5yEJB3UL9wQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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