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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d930a62fc1fe8a7992e9bd6b8dbb026e4c5723fdccd5287c48d3c9e46d98cc' 
  AND token = '0X/SDoq2s/20eOny1sz1zbQbDW50JqYvmqnz8Dpf8l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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