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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f604d44655d0133905de49454ea9a9ba1dc08e9bf796c7b99162b8f04252fceb' 
  AND token = 'sQk1CTIHDVYz7lPg8n8yMd4NSa0gWQOA2EqogQolKQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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