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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca256e7846de4bd72f856af37a1069ce7b570aa1470415eb864170d5ba34895d' 
  AND token = 'zsG2ppADnNynDXxCKDiJGe8xBVTBObR1eWoIRDl1eYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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