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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb30ad24661ce495b9a0a2a5a526415851ec972303f8bd19786ff750a04fff0' 
  AND token = 'xpKg+qeuhNdUbyc+arEjEU4Z/+f4PRJsbYxchNiKU94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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