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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c153a68a704c7d5086a90c8d13f91dbe4c3686d77b7e855e4c1f3ff12ac3b8' 
  AND token = 'vNpuAikHWCvdW2l01KvN1i3gwc6QfA5dXMSdjKfS9gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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