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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f18c4d3a1d0e96ff77fbb817fd43ac304ad9f83dd5e2283f46b81aacb62a99' 
  AND token = 'kFIZy1Gt+BuzK9S4MIbmk1cKo2F+bvJ/ZOei4yDZHJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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