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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df754971d5e98547b449c82ab21a301fac3a8bd729bbdf8ab98ed81d128567c7' 
  AND token = 'kn4hprYfQ023Tjz/gZfoMayXoPu+g/geJ+4yTt4/TIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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