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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56589feacadb0e4004c56c0ad6d39af10f95943fcc218413eebaab92f9d4a3b8' 
  AND token = 'xaSnDStoBSpoI6+mBrgGk1uDK9Me24FOVTRmWv/XBQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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