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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defaa0ee16570e6c6d8bd47dc20dc9632d810e7acd0533d3e6635f27f039936c' 
  AND token = 'T30Mp/ZHxga7j78GSw9M5NFL5nw9LgAqBLPB0+eEQVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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