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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0208dc4be7a4f1408898080e59cfce1e37dc5c16759c5e4a0b8ab3efb4fd51d3' 
  AND token = '+UJx5rotCWYs31Hb5h8XM2aPvh/V8HfVS2Th22AgP9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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