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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d2da6b8d2fb4b30b9d944cd8d88f94c40fede848a797aa20c3cac5fb2319aa' 
  AND token = 'GAZiU8qxG/opZkr64iCvdq05QbcxIIE/nN5QQxCyye0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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