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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866a13aa421ab923f54ca63e8eb4698a1844cc8942d7b3898f7beb4c65dbfa92' 
  AND token = '+OWnqctquJ9MFG20wf4XC5IfAgSjbqwJ3kfH1qI3Dkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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