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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799e06032a67e0b273c3f1da3941b9bdfa5b537b487081d571ae86d5881534aa' 
  AND token = '/ZtR3MVm5LFRTIafMNrX/2wpOh3cKxl7ubo/sMTpe/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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