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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58652d27f3226b90b51df1ef2c98d9c35cab2a433ccb00fea34da59c1aa76c4' 
  AND token = '1Tfeva+r4f/89YsTR6FULP10kcgTSs6vWgIDGdZdBOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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